"equation" - key terms from Wikipedia

accounting equation
arrhenius equation
balance equation
bellman equation
bernoulli's equation
boltzmann equation
characteristic equation
chemical equation
continuity equation
cubic equation
demand equation
difference equation
differential equation
diffusion equation
diophantine equation
dirac equation
drake equation
electromagnetic wave equation
equation
equation	of motion
equation	of state
equation	of time
field equation
following equation
functional equation
groundwater flow equation
heat equation
helmholtz equation
human equation
integral equation
langevin equation
laplace's equation
laplace equation
master equation
momentum equation
nernst equation
ordinary differential equation
original equation
partial differential equation
polynomial equation
price equation
quadratic equation
quintic equation
rate equation
riccati equation
rocket equation
structural equation	modeling
van der waals equation
vries equation
wave equation